I just did a firmware update on my Denon AVR-990. Does anyone know how to view the latest firmware revision on the unit or on the web? When I do an update, I'd like to know what they have fixed / changed.

I guess receiver makers don't like advertising "what was wrong" so release notes are hard to come by. Over on AVS, there was a guy (captavs) who maintained a FW tracking thread. You might also try searching for "denon batpig" to see if he has a release note.